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CVE-2025-21661

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: gpio: virtuser: fix missing lookup table cleanups When a virtuser device is created via configfs and the probe fails due to an…

Published Jan 21, 2025CWE-401EPSS 0.19%

Overview

CVE-2025-21661 is a high-severity vulnerability. It was published on January 21, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

gpio: virtuser: fix missing lookup table cleanups

When a virtuser device is created via configfs and the probe fails due

to an incorrect lookup table, the table is not removed. This prevents

subsequent probe attempts from succeeding, even if the issue is

corrected, unless the device is released. Additionally, cleanup is also

needed in the less likely case of platform_device_register_full()

failure.

Besides, a consistent memory leak in lookup_table->dev_id was spotted

using kmemleak by toggling the live state between 0 and 1 with a correct

lookup table.

Introduce gpio_virtuser_remove_lookup_table() as the counterpart to the

existing gpio_virtuser_make_lookup_table() and call it from all

necessary points to ensure proper cleanup.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/a619cba8c69c434258ff4101d463322cd63e1bdcRefgit.kernel.org/stable/c/d72d0126b1f6981f6ce8b4247305f359958c11b5

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21661?

CVE-2025-21661 is a high-severity vulnerability. It was published on January 21, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-21661?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-21661?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-21661?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21661 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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